Sapphire polycrystalline material in the preparation of embryos in a very clean environment, and the atmosphere does not contact any metal, to a purity guaranteed; single weight more than 30 kg, the specific gravity greater than 3.2g/cm3, the crucible of the same size can be placed more weight sapphire polycrystalline rods, which will help the growth of large crystals; little bubbles of the grown crystals of high quality.

Because polycrystalline billet through a high temperature melting, embryo compound gas content is low, less the grown crystal bubbles, crystals of high quality . By comparison, the use of polycrystalline growth of 60 kg blank crystal crystal material can be compared Flame pay an extra 2 inches grown crystal ingot 300-700mm, single crystal sapphire improve utilization and reduce the cost of a single crystal. Companies can diameter and height according to the user's requirements of production, meet Ky, Cz, etc. Methods for growing large sapphire requirements.